add_executable(1_Mountain_training "1_Mountain_training.c")
add_executable(2_Separate_The_Odd_And_Even_Number "2_Separate_The_Odd_And_Even_Number.c")
add_executable(3_Substring_Judgement "3_Substring_Judgement.c")
add_executable(4_Look_Up_What_Day_of_The_Week "4_Look_Up_What_Day_of_The_Week.c")